|Entrant|Constructor|Chassis|Engine|No|Driver|
|---|---|---|---|---|---|
|Team Ensign|Ensign|N180B|Cosworth DFV V8|3|Jim Crawford|
|Team Ensign|Ensign|N180B|Cosworth DFV V8|4|Joe Castellano|
|Colin Bennett Racing|McLaren|M29|Cosworth DFV V8|6|Arnold Glass|
|Colin Bennett Racing|March|811|Cosworth DFV V8|7|Val Musetti|
|Team Sanada|Fittipaldi|F8|Cosworth DFV V8|8|Tony Trimmer|
|Warren Booth|Shadow|DN9|Cosworth DFV V8|11|Warren Booth|
|John Jordan|BRM|P207|BRM 202 V12|12|David Williams|
|Nick Mason|Tyrrell|008|Cosworth DFV V8|14|John Brindley|
|EMKA Productions|Williams|FW07|Cosworth DFV V8|16|Steve O'Rourke|
|Team Peru|Williams|FW07|Cosworth DFV V8|82|Jorge Koechlin|

Question: what is the total number of drivers listed?
Answer: 10